Improvement in steam-boilers



lINtTED STATES PATENT OFFICE.,

JAMES MONTGOMERY, OE MEMPHIS, TENNESSEE.

IMPROVEMENT IN STEAM-BOILERS..

Specification forming part of Letters Patent No. 4,331, dated December 2G, 1845.

To aZZ whom, t may concern:

Be it known that I, JAMES MONTGOMERY, of Memphis, in the county of Shelby and State of Tennessee, have made certain new and useful Improvements in the Manner ofl Constructing a Vertical Tubular Steam-Boiler; and I do hereby declare that the following is a full and exact description thereof.

The improvements which I have made have in view an economical mode of using the fuel, the establishing of a perfect circulation of the water through the tubes, the depositing of sedimentary matter in a receptacle below the fire, and the preventingof the passing of water from foaming or other causes into the steam-pipe and cylinder.

In the accompanying drawings, Figure 'l is a vertical section through the centerl of the boiler and through the furnace attached thereto. Fig. 2 is a view of a part of the boiler, supposing the furnace part to be removed and a vertical section to be made ot' the sectional part in the line a; of Fig. l and at right angles thereto. Fig. 3 is a top View of the termination ot' the boiler-tubes and of the shell or case by which they are surrounded. Fig. 4 is a front view of the furnace and boiler.

In each of the figures where thesame parts occur they are designated by the same letters of reference.

The boiler in that part which surrounds the tubes is formed of two concentric vertical cylinders, excepting where the heat and flame from the furnace are introduced and where the gaseous products of combustion escape to be conducted off by the flue.

A is the outer and A the innershell of the boiler, with a water-space A2 between them.

B B are the tubes which pass through and are made fast to two heads G C and D D, that are convex upward.

E E is the steam-space, and F the water-line.

G G is that part of the boiler which is below the lower tube-head C C, and I-I H the bottom of the boiler. This-bottom is convex outward and may be either spherical or conical, and as the direct heat from the firey is never applied to this bottom the water contained between it and the lower tube-head C C is in a state of comparative quiescence, in consequence of which the sedimentary matter which forms incrustations on the bottom and other parts of boilers as ordinarily constructed will settle down in this part in a loose unaggregated state. At I in the center of this bottom I place a blow-off valve, which I denominate a mud-valve, and which may be opened when requisite for the purpose of blowing otf the accumulated sediment, which it will do effectually without occasioning any considerable waste of water.

J J is the fire-chamber of the furnace; II, the grate-bars, and L the ash-pit. The furnace I prefer to place, as represented in the drawings, in such manner as that the direct heat from it shall enter among the tubes B B at their upper section above a diaphragm or partition M M, over which the draft will pass, as indicated by the arrows, and then into the lower fine-space M M and around the furnace to the chimney O.

The furnace I surround with awater-space P P, which communicates with the wat-er in the boiler. This furnace may be placed lower down, if desired, and the heat be made to im# pinge directlyon the lower part of the tubes; but I am well assured that the arrangement as represented will be found to be the best.

Below the upper head of the boiler I place a metallic shield Q Q, leaving an annular steam-space of a few inches around it, which will in a great degree repress the foaming of the Water when the pressure is taken off bythe admittance of steam into the cylinder, and will thereby prevent the injurious and frequently destructive result of the entrance of water with the steam. Under my arrangement of the shield the steam isrdrawn equally from all parts of the circumference of the boiler.

The production of a free and perfect circulation of the water in a boiler has frequently been aimed at, but has not, as I verily believe, been heretofore attained; but by my plan of arranging the part-s of the boiler in such way as that its bottom shall not be subjected to the direct action of the heat and of introducing it laterally among the vertical tubes I not only allow of the depositing of the sediment, as stated, but cause a decided and rapid circulation, preventing all incrustation on the interior of the tubes and augmenting the generation of steam. To clear out any ashes that may accumulate around the lower ends of the tubes, an opening closed in the manner of. aman-hole must be prepared, as' at R, or in any other convenient situation;

A S S S, Fig.4, are the' ordinary openings into the fire-chamber.

Having thus fully described the nature of my improvement in the steam-engine boiler and shown the operation of the same, what I claim as new therein, and desire to secure by Letters Patent, is

1. Arranging the [ire-chamber or furnace of a tubular boiler at the side, so that the heat shall act on the upper half of the tubes, in combination with a diaphragm or partition and Hue to carry off the Haine, heated air, dsc., to act on the lower half of the tubes after acting on the upper half, as herein described.

rounding water-space to Wash the sediment toward the mud or blow-oi valve, as herein described.

, JAS. MONTGOMERY.

Witnesses:

GUY C. HUMPHRIES, EDWIN L. BRUNDAGE. 

